Sewing-machine.



No. 643,326. Patented Feb. I3, |9100.

s. m. JAcoBY. SEWING MACHINE.

kApplicaton led May 8, 1899.)

(No Model.)

c-m A i anism represented in position No. 1.

SELLMAR M. JACOBY, OF NEW YORK, N. Y.

SPECIFICATION forming part of Letters Patent No. 643,326, dated February13, 1900.

Application tiled May 8,1899. Serial No. 716,041. (No model.)

To @ZZ whom it may concern:

Be it known that I, SELLMAR M. JACOBY, a citizen of the United States,and a resident of New York, in the county and State of New York, haveinvented a new and useful Improvement in Sewing-Machines, of which thefollowing is a specification.

My invention relates to'an improvement in sewing-machines, and moreparticularly to the feed mechanism thereof.

The object of my invention is to provide a feed mechanism which will runvery smoothly and easily, thereby reducing the wear and tear of themachine to a minimum and also enabling-the machine to be run at averyhigh rate of speed.

A practical embodiment of my invention is represented in theaccompanying drawings, in which-- Figure l represents a front view of aportion of a sewing-machine with my improved feed mechanism appliedthereto. Fig. 2 is an end view of the same, with the feed mech- Fig. 3is a rear view of the same. Fig. 4c is a top plan view partially insection. Fig. 5 represents an end View with the feed mechanism inposition No. 2. Fig. (i represents an end View with the feed mechanismin position No. 3, and Fig. 7 is an end view with `the feed mechanism inposition No. 4t.

In the drawings I have represented the feed mechanism in four positionsassumed at the beginning of each quadrant of angular motion of thefeed-actuating shaft during one revolution of the said shaft, and I haveat the same time also shown the proper position of the needle at thesame periods.

The base of the sewing-machine is denoted by A, and it is surmounted, asis usual,l by a table a.

The foot is denoted by B and the needle by b, and they may be operatedin the usual manner in conjunction with the feed mechanism.

The rotary feed-actuating shaft is denoted by C, and it is mounted inthe base A of the frame, as is usual. The outer end of thefeed-actuating shaft C is provided with an eccentric c for imparting tothe feeding mechanism its forward and backward reciprocating movementsand with a second eccentric c' for imparting to the feed mechanism itsrei ciprocating upward and downward movements. These eccentrics arearranged in the proper relation to the center of the shaft C so as toimpart t-he several movements to the feed mechanisms at the properperiods during the revolution of the shaft.

The feed-bar is denoted by D, and it is provided with a feed-dog d,secured thereto in vertical adjustment by means of a set-screw d. Thisfeed-bar D is hinged at its rear end, as shown at d2, to the free end ofa rocking arm E, which is hinged at e to the outer face a of the base A.The forward end of the feed-bar D is bifurcated 'to receive therein theeccentric c for imparting to the feedbar its reciprocating upward anddownward movements.

The device which I employ for imparting to the feed-bar itsreciprocating forward and backward movements comprises a toggle-1everhaving one of its arms F connected with the rocking arm E and its otherarm adjustably secured to the end face a of the base A, whichtoggle-lever is connected at the junction of its arms with aneccentric-arm F2, the strap of which embraces the eccentric c upon therotary feed-actuating shaft C. The rear end of the arm F of thetoggle-lever is secured at f to the said rocking arm E ata point betweenits hinged connection with the end face of the base A and its connectionwith the feed-bar D. The forward end of the arm F of the toggle-lever isprovided with a screw f', which passes through a curved elongated slota? in the face of the base A, which screw is provided with a clampingthumb-nut f2 upon the opposite side of the face from the arm F', so thatthe outer end of the said arm may be adj ustably secured in differentpositions nearer to or farther from the hinged end of the rocking arm E.The screwf is preferably provided with a sleeve f3, fitted to travelwithin the slot a2 for guiding, the screw when it is being adjusted.

By the above arrangement the length of the feed may be readily increasedor decreased by adjusting the free end of the arm F of the toggle-levertoward and away from the hinged end of the rocking arm E.

` By the structure hereinabove set forth I am enabled to provide a feedmechanism forsewing-`rnachines which will run Very smoothly IOO and withvery slight Wear and tear and also provide a mechanism in which theseveral parts are so located that access may loe readily obtained tothem for purposes of adjustment or replacement.

What I claim isl. A feed mechanism for sewing-machines comprising asuitable support, a rotary actuating-shaft having two eocentricsthereon, a rocking arm hinged to said support, a feedbar hinged to saidarm and engaged With one of the said eccentrics, a toggle-lever havingone of its arms hinged to the support and its other arm hinged to thesaid rocking arm, and an eccentric-arm embracing the other eccentric onthe rotary actuatin g-shaf t and connected with the toggle-lever at thejunction of its arms, substantially as set forth.

2. A feed mechanism for sewing-machines comprisinga suitable support, arotary actuating-shaft having two eccentrics thereon, a

rocking arm hinged to said support,a feed-bar hinged to said rocking armand engaged with one of the said eccentrics, a toggle-lever having oneof its arms hinged to the said rocking arm and its other arm hinged tothe support, an eccentric-arm embracing the other eccentric on therotary actuatingshaft and connected at the junction of the arms of thetoggie-lever and means for securing the hinged end of the arm of thetoggle-lever Which is connected With the support in different positionson the support7 substantially as set forth.

In testimony that I claim the foregoing as my invention I have signed myname, in presence of two Witnesses, this 5th day of May, 1899.

SELLMAR M. JACOBY.

Witnesses:

FREDK. HAYNES, EDWARD VIEsER.

